[avr-gcc-list] Where is the "official" site to download avr-gcc source?

[Dave Comer]

My apologies in advance if this is obvious to you; I've searched through 
Source Forge, AVR-Freaks and am not certain where the "official" site is to 
obtain the source code to avr-gcc. I'd like to compile avr-gcc on both 
Linux and Windows with the eventual goal of understanding the process for 
my edification. Can someone tell me where the "official site is to download 
the code to compile on both platforms? Also, is there a good reference for 
GCC internals (I know the GNU main site has documentation, I'm looking for 
tips on third party references similar to the book by Kurt Wall, "The 
Definitive Guide to GCC", Apress that deals more with the internal GCC 
architecture.

Thanks,

Dave Comer